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@ 2017-06-02T19:16:30Z

<?php
abstract class Enum {
	private $name;
	protected $allow = [];
	private static $enums;
	
	private function __construct($name) {
	    if (!in_array($name, $this->allow, true)) {
	        throw new \TypeError('Undefined enum ' . get_class($this) . '::' . $name . '()');
	    }
	    $this->name = $name;
	}
	
	public static function __callStatic($name, $args) {
		$id = static::class . ".$name";
		return self::$enums[$id] ?? self::$enums[$id] = new static($name);
	}
	
	public function __toString() {
		return $this->name;
	}
}

/**
 * @method static RED()
 * @method static GREEN()
 * @method static BLUE()
 */
class Color extends Enum {
    protected $allow = ['RED', 'GREEN', 'BLUE'];
}

$red = Color::RED();
$red2 = Color::RED();
$green = Color::GREEN();

var_dump($red === $red2);
var_dump($red == $red2);
var_dump($red === $green);
var_dump($red == $green);
var_dump((string) $red);
var_dump((string) $green);

$geern = Color::GEERN(); // Intentional typo. Throws.

Output for git.master, git.master_jit, rfc.property-hooks: bool(true) bool(true) bool(false) bool(false) string(3) "RED" string(5) "GREEN" Fatal error: Uncaught TypeError: Undefined enum Color::GEERN() in /in/aoPUl:9 Stack trace: #0 /in/aoPUl(16): Enum->__construct('GEERN') #1 /in/aoPUl(44): Enum::__callStatic('GEERN', Array) #2 {main} thrown in /in/aoPUl on line 9
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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